body{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: aquamarine;
}
.clock{
    display: flex;
    flex-direction: column;
   text-align: center;
}
#hour,#minute,#second{
    font-size: 48px;
    color: #fff;
    margin:0 10px;
}